PORTSMOUTH
SubstationOhio · OHIO POWER CO
PORTSMOUTH is an electric transmission substation in Ohio, operated by OHIO POWER CO. It is classified as sub-transmission (138 kv) and connects 1 transmission line. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #16633 | 138 kV | OHIO POWER CO | IN SERVICE | 1.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of PORTSMOUTH, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| HANGING ROCK ENERGY FACILITY | Substation-Adjacent | KY | Greenup County | 765 kV | 1,000 MW | 3.2 yrs | 74.7 |
| TAP137802 | Substation-Adjacent | OH | Pike County | 345 kV | 600 MW | 3.2 yrs | 72.2 |
| DON MARQUIS 765 KV | Substation-Adjacent | OH | Pike County | 765 kV | 1,000 MW | 3.2 yrs | 72.1 |
| HANGING ROCK | Substation-Adjacent | KY | Boyd County | 765 kV | 1,000 MW | 3.2 yrs | 72.0 |
| UNKNOWN116630 | Substation-Adjacent | OH | Jackson County | 138 kV | 100 MW | 3.2 yrs | 69.1 |
| UNKNOWN121310 | Substation-Adjacent | KY | Boyd County | 138 kV | 100 MW | 3.2 yrs | 68.9 |
| TAP137356 | Substation-Adjacent | OH | Adams County | 345 kV | 600 MW | 3.2 yrs | 67.4 |
| DON MARQUIS | Substation-Adjacent | OH | Pike County | 345 kV | 600 MW | 3.2 yrs | 67.3 |
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
This page shows a public slice of the GridCensus dataset for PORTSMOUTH substation, Ohio. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.